Fulminant metastatic melanoma complicated by a microangiopathic hemolytic anemia.

A 34-year-old male acutely presented with widely disseminated malignant melanoma, a microangiopathic hemolytic anemia, and disseminated intravascular coagulation. Although the patient had a history of intense childhood exposure to ultraviolet light and an occupational exposure to organic dyes, he had no history of a precursor skin lesion. The histopathology of the patient's bone marrow revealed sheets of malignant cells immunoreactive with S-100, HMB-45, and vimentin and also staining positively for melanin. A bone marrow aspirate revealed myeloid precursors filled with melanin-bearing vacuoles. Immunophenotypic analysis of the patient's bone marrow by flow cytometry revealed a paucity of hematopoietic cells. A karyotypic analysis of the patient's tumor cells demonstrated an abnormal hypertriploid composite clone characterized by multiple numerical and structural abnormalities. Although the patient was treated aggressively with transfusional support, heparin, and chemotherapy, he expired 3 weeks after diagnosis. This is the first recognized case of metastatic melanoma occurring in association with a microangiopathic hemolytic anemia.